BTRFS error (device loop3): fail to start transaction for status update: -28 ====================================================== WARNING: possible circular locking dependency detected 4.19.211-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.3/28579 is trying to acquire lock: 00000000a0249371 (&fs_info->qgroup_ioctl_lock){+.+.}, at: btrfs_remove_qgroup+0xae/0x770 fs/btrfs/qgroup.c:1415 but task is already holding lock: 000000003836b59b (sb_internal#2){.+.+}, at: sb_start_intwrite include/linux/fs.h:1626 [inline] 000000003836b59b (sb_internal#2){.+.+}, at: start_transaction+0xa37/0xf90 fs/btrfs/transaction.c:528 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (sb_internal#2){.+.+}: sb_start_intwrite include/linux/fs.h:1626 [inline] start_transaction+0xa37/0xf90 fs/btrfs/transaction.c:528 btrfs_quota_enable+0x169/0x10b0 fs/btrfs/qgroup.c:905 btrfs_ioctl_quota_ctl fs/btrfs/ioctl.c:5233 [inline] btrfs_ioctl+0x622c/0x76d0 fs/btrfs/ioctl.c:6021 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #0 (&fs_info->qgroup_ioctl_lock){+.+.}: __mutex_lock_common kernel/locking/mutex.c:937 [inline] __mutex_lock+0xd7/0x1190 kernel/locking/mutex.c:1078 btrfs_remove_qgroup+0xae/0x770 fs/btrfs/qgroup.c:1415 btrfs_ioctl_qgroup_create fs/btrfs/ioctl.c:5337 [inline] btrfs_ioctl+0x661c/0x76d0 fs/btrfs/ioctl.c:6025 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(sb_internal#2); lock(&fs_info->qgroup_ioctl_lock); lock(sb_internal#2); lock(&fs_info->qgroup_ioctl_lock); *** DEADLOCK *** 2 locks held by syz-executor.3/28579: #0: 00000000ee76e215 (sb_writers#18){.+.+}, at: sb_start_write include/linux/fs.h:1579 [inline] #0: 00000000ee76e215 (sb_writers#18){.+.+}, at: mnt_want_write_file+0x63/0x1d0 fs/namespace.c:418 #1: 000000003836b59b (sb_internal#2){.+.+}, at: sb_start_intwrite include/linux/fs.h:1626 [inline] #1: 000000003836b59b (sb_internal#2){.+.+}, at: start_transaction+0xa37/0xf90 fs/btrfs/transaction.c:528 stack backtrace: CPU: 0 PID: 28579 Comm: syz-executor.3 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1222 check_prev_add kernel/locking/lockdep.c:1866 [inline] check_prevs_add kernel/locking/lockdep.c:1979 [inline] validate_chain kernel/locking/lockdep.c:2420 [inline] __lock_acquire+0x30c9/0x3ff0 kernel/locking/lockdep.c:3416 lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3908 __mutex_lock_common kernel/locking/mutex.c:937 [inline] __mutex_lock+0xd7/0x1190 kernel/locking/mutex.c:1078 btrfs_remove_qgroup+0xae/0x770 fs/btrfs/qgroup.c:1415 btrfs_ioctl_qgroup_create fs/btrfs/ioctl.c:5337 [inline] btrfs_ioctl+0x661c/0x76d0 fs/btrfs/ioctl.c:6025 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f6fc7b600a9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f6fc60d2168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f6fc7c7ff80 RCX: 00007f6fc7b600a9 RDX: 00000000200011c0 RSI: 000000004010942a RDI: 0000000000000005 RBP: 00007f6fc7bbbae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd55cd362f R14: 00007f6fc60d2300 R15: 0000000000022000 XFS (loop1): unknown mount option [uid=00000000000000000000]. tls_set_device_offload_rx: netdev Y4`Ҙ with no TLS offload audit: type=1804 audit(1672621715.978:1296): pid=28595 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir3422897799/syzkaller.ukM1AQ/1634/bus" dev="sda1" ino=14277 res=1 audit: type=1804 audit(1672621716.018:1297): pid=28690 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir3422897799/syzkaller.ukM1AQ/1634/bus" dev="sda1" ino=14277 res=1 tls_set_device_offload_rx: netdev sit0 with no TLS offload tls_set_device_offload_rx: netdev Y4`Ҙ with no TLS offload BTRFS info (device loop3): using free space tree tls_set_device_offload_rx: netdev sit0 with no TLS offload BTRFS info (device loop3): has skinny extents tls_set_device_offload_rx: netdev Y4`Ҙ with no TLS offload tls_set_device_offload_rx: netdev sit0 with no TLS offload XFS (loop1): unknown mount option [uid=00000000000000000000]. audit: type=1804 audit(1672621716.958:1298): pid=28718 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir3422897799/syzkaller.ukM1AQ/1635/bus" dev="sda1" ino=14477 res=1 BTRFS info (device loop3): using free space tree BTRFS info (device loop3): has skinny extents audit: type=1804 audit(1672621717.048:1299): pid=28886 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir3422897799/syzkaller.ukM1AQ/1635/bus" dev="sda1" ino=14477 res=1 audit: type=1804 audit(1672621717.098:1300): pid=28890 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir3422897799/syzkaller.ukM1AQ/1635/bus" dev="sda1" ino=14477 res=1 audit: type=1804 audit(1672621717.108:1301): pid=28889 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir3422897799/syzkaller.ukM1AQ/1635/bus" dev="sda1" ino=14477 res=1 audit: type=1804 audit(1672621717.108:1302): pid=28718 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.1" name="/root/syzkaller-testdir3422897799/syzkaller.ukM1AQ/1635/bus" dev="sda1" ino=14477 res=1 x_tables: duplicate underflow at hook 1 IPVS: ftp: loaded support on port[0] = 21 ieee802154 phy0 wpan0: encryption failed: -22 ieee802154 phy1 wpan1: encryption failed: -22 audit: type=1804 audit(1672621717.228:1303): pid=28903 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.0" name="/root/syzkaller-testdir46402993/syzkaller.QEKlNp/1671/bus" dev="sda1" ino=15556 res=1 audit: type=1804 audit(1672621717.608:1304): pid=28938 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.0" name="/root/syzkaller-testdir46402993/syzkaller.QEKlNp/1672/bus" dev="sda1" ino=15543 res=1 IPVS: ftp: loaded support on port[0] = 21 audit: type=1804 audit(1672621717.938:1305): pid=28976 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.0" name="/root/syzkaller-testdir46402993/syzkaller.QEKlNp/1673/bus" dev="sda1" ino=15551 res=1 x_tables: duplicate underflow at hook 1 REISERFS (device loop3): found reiserfs format "3.6" with non-standard journal REISERFS (device loop3): using ordered data mode reiserfs: using flush barriers tls_set_device_offload_rx: netdev sit0 with no TLS offload REISERFS (device loop3): journal params: device loop3, size 512, journal first block 18, max trans len 256, max batch 225, max commit age 30, max trans age 30 IPVS: ftp: loaded support on port[0] = 21 x_tables: duplicate underflow at hook 1 REISERFS (device loop3): checking transaction log (loop3) tls_set_device_offload_rx: netdev sit0 with no TLS offload tls_set_device_offload_rx: netdev sit0 with no TLS offload tls_set_device_offload_rx: netdev sit0 with no TLS offload REISERFS (device loop3): Using r5 hash to sort names REISERFS (device loop3): Created .reiserfs_priv - reserved for xattr storage. REISERFS (device loop3): found reiserfs format "3.6" with non-standard journal REISERFS (device loop3): using ordered data mode reiserfs: using flush barriers REISERFS (device loop3): journal params: device loop3, size 512, journal first block 18, max trans len 256, max batch 225, max commit age 30, max trans age 30 REISERFS (device loop3): checking transaction log (loop3) REISERFS (device loop3): Using r5 hash to sort names REISERFS (device loop3): Created .reiserfs_priv - reserved for xattr storage.